Zoom lens system

Details Zoom lens system Zoom lens system

2008-01-29

2008-01-29

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S680000, C359S681000, C359S682000

Reexamination Certificate

active

07324289

ABSTRACT:
A zoom lens system comprises, in order from an object side, a negative first lens group G1,a positive second lens group G2and a positive third lens group that has positive refractive power. In the zoom lens system, zooming is carried out by moving the first lens group and the second lens group, the first lens group consists of two or three lenses that include a negative glass lens located closest to the object side, the second lens group consists, in order from the object side, of a cemented lens composed of a positive glass lens and a negative glass lens and a plastic meniscus lens that is convex on the object side and both surfaces of which are aspherical, the third lens group consists of one positive plastic lens, and a combined focal length f2of the second lens group and a focal length Lf23of the plastic meniscus lens in the second lens group satisfy the following conditionin-line-formulae description="In-line Formulae" end="lead"?0<|f2/Lf23|<0.3.in-line-formulae description="In-line Formulae" end="tail"?

REFERENCES:
patent: 6308011 (2001-10-01), Wachi et al.
patent: 2002-072091 (2002-12-01), None
patent: 2002-072093 (2002-12-01), None

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